/*
** $Id: luac.c,v 1.52 2005/11/11 14:03:13 lhf Exp $
** Lua compiler (saves bytecodes to files; also list bytecodes)
** See Copyright Notice in lua.h
*/

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define luac_c
#define LUA_CORE

#include "lua.h"
#include "lauxlib.h"

#include "ldo.h"
#include "lfunc.h"
#include "lmem.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lstring.h"
#include "lundump.h"

#define PROGNAME	"luac"		/* default program name */
#define	OUTPUT		PROGNAME ".out"	/* default output file */

static int listing=0;			/* list bytecodes? */
static int dumping=1;			/* dump bytecodes? */
static int stripping=0;			/* strip debug information? */
static char Output[]={ OUTPUT };	/* default output file name */
static const char* output=Output;	/* actual output file name */
static const char* progname=PROGNAME;	/* actual program name */

static void fatal(const char* message)
{
	fprintf(stderr,"%s: %s\n",progname,message);
	exit(EXIT_FAILURE);
}

static void cannot(const char* what)
{
	fprintf(stderr,"%s: cannot %s %s: %s\n",progname,what,output,strerror(errno));
	exit(EXIT_FAILURE);
}

static void usage(const char* message)
{
	if (*message=='-')
		fprintf(stderr,"%s: unrecognized option " LUA_QS "\n",progname,message);
	else
		fprintf(stderr,"%s: %s\n",progname,message);
	fprintf(stderr,
		"usage: %s [options] [filenames].\n"
		"Available options are:\n"
		"  -        process stdin\n"
		"  -l       list\n"
		"  -o name  output to file " LUA_QL("name") " (default is \"%s\")\n"
		"  -p       parse only\n"
		"  -s       strip debug information\n"
		"  -v       show version information\n"
		"  --       stop handling options\n",
		progname,Output);
	exit(EXIT_FAILURE);
}

#define	IS(s)	(strcmp(argv[i],s)==0)

static int doargs(int argc, char* argv[])
{
	int i;
	if (argv[0]!=NULL && *argv[0]!=0) progname=argv[0];
	for (i=1; i<argc; i++)
	{
		if (*argv[i]!='-')			/* end of options; keep it */
			break;
		else if (IS("--"))			/* end of options; skip it */
		{
			++i;
			break;
		}
		else if (IS("-"))			/* end of options; use stdin */
			break;
		else if (IS("-l"))			/* list */
			++listing;
		else if (IS("-o"))			/* output file */
		{
			output=argv[++i];
			if (output==NULL || *output==0) usage(LUA_QL("-o") " needs argument");
			if (IS("-")) output=NULL;
		}
		else if (IS("-p"))			/* parse only */
			dumping=0;
		else if (IS("-s"))			/* strip debug information */
			stripping=1;
		else if (IS("-v"))			/* show version */
		{
			printf("%s  %s\n",LUA_VERSION,LUA_COPYRIGHT);
			if (argc==2) exit(EXIT_SUCCESS);
		}
		else					/* unknown option */
			usage(argv[i]);
	}
	if (i==argc && (listing || !dumping))
	{
		dumping=0;
		argv[--i]=Output;
	}
	return i;
}

#define toproto(L,i) (clvalue(L->top+(i))->l.p)

static Proto* combine(lua_State* L, int n)
{
	if (n==1)
		return toproto(L,-1);
	else
	{
		int i,pc;
		Proto* f=luaF_newproto(L);
		setptvalue2s(L,L->top,f); incr_top(L);
		f->source=luaS_newliteral(L,"=(" PROGNAME ")");
		f->maxstacksize=1;
		pc=2*n+1;
		f->code=luaM_newvector(L,pc,Instruction);
		f->sizecode=pc;
		f->p=luaM_newvector(L,n,Proto*);
		f->sizep=n;
		pc=0;
		for (i=0; i<n; i++)
		{
			f->p[i]=toproto(L,i-n-1);
			f->code[pc++]=CREATE_ABx(OP_CLOSURE,0,i);
			f->code[pc++]=CREATE_ABC(OP_CALL,0,1,1);
		}
		f->code[pc++]=CREATE_ABC(OP_RETURN,0,1,0);
		return f;
	}
}

static int writer(lua_State* L, const void* p, size_t size, void* u)
{
	UNUSED(L);
	return (fwrite(p,size,1,(FILE*)u)!=1) && (size!=0);
}

struct Smain {
	int argc;
	char** argv;
};

static int pmain(lua_State* L)
{
	struct Smain* s = (struct Smain*)lua_touserdata(L, 1);
	int argc=s->argc;
	char** argv=s->argv;
	Proto* f;
	int i;
	if (!lua_checkstack(L,argc)) fatal("too many input files");
	for (i=0; i<argc; i++)
	{
		const char* filename=IS("-") ? NULL : argv[i];
		if (luaL_loadfile(L,filename)!=0) fatal(lua_tostring(L,-1));
	}
	f=combine(L,argc);
	if (listing) luaU_print(f,listing>1);
	if (dumping)
	{
		FILE* D= (output==NULL) ? stdout : fopen(output,"wb");
		if (D==NULL) cannot("open");
		lua_lock(L);
		luaU_dump(L,f,writer,D,stripping);
		lua_unlock(L);
		if (ferror(D)) cannot("write");
		if (fclose(D)) cannot("close");
	}
	return 0;
}

int main(int argc, char* argv[])
{
	lua_State* L;
	struct Smain s;
	int i=doargs(argc,argv);
	argc-=i; argv+=i;
	if (argc<=0) usage("no input files given");
	L=lua_open();
	if (L==NULL) fatal("not enough memory for state");
	s.argc=argc;
	s.argv=argv;
	if (lua_cpcall(L,pmain,&s)!=0) fatal(lua_tostring(L,-1));
	lua_close(L);
	return EXIT_SUCCESS;
}
